=> R0 = Previous object pointer (0 first time round).
R1 ! Picture structure or zero.
R2 = Object type to list
(or 0 for all types)
<= R0 = Object pointer of next object (0 if no more).
This function will find the next block of a particular (or any) type from any starting block in the picture structure.
Example
Euclid_List Example
To find all blocks of type TYPE% (or all blocks if TYPE%=0):
SYS "Euclid_List",,,TYPE% TO P%
WHILE P%
PRINT "Object at "~P%
SYS "Euclid_List",P%,,TYPE% TO P%
ENDWHILE
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